발간논문

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Vol.34, No.10, 1321 ~ 1332, 1996
Title
Research Paper - Mechanical Behavior - : Effects of C and Cr on the As - Welded Structures and Mechanical Properties of Fe ( 12 - 17 ) %Cr - ( 0.19 - 0.32 ) %C Hardfacing Stainless Steels
정재영Jae Young Jung, 백응율Eung Ryul Baek, 안상호Sang Ho Ahn, 추성훈Seong Hun Choo, 이성학Sung Hak Lee, 김낙준Nack Joon Kim
Abstract
Fe-Cr-C hardfacing stainless steels were deposited on S45C carbon steel using a submerged arc welding process. The effects of C and Cr contents on the as-welded structures of Fe-(12-17)%Cr-(0.19-0.32)%C hardfacing stainless steels have been studied by microstructural observation and mechanical testing. The variation of as-welded structure as a function of C and Cr contents was compared with the microstructure predicted by the Schaeffler diagram. In Fe-12%Cr-(0.19-0.32)%C stainless steels, carbon solute atoms were primarily segregated in the interdendritic regions. And Cr-rich carbides tends to precipitate along the interdendritic regions in the stainless steels having C contents higher than 0.2%C. This explains why that the abrupt decreases of mechanical properties and the cleavage fracture surfaces appear in the stainless steels having C contents higher than 0.20%. The sliding wear mechanism varied from the adhesion to tribochemical reaction with increasing hardness of weld metal. However, the wear resistance tends to be affected by the introduction of abrasion. wear mode due to the hard carbide particles. This can be confirmed by the fact that its wear resistance increases with the increase of matrix hardness of weld metal.
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